The OEIS Foundation is grateful to everyone who made a donation during our Annual Appeal. Visit the new and spectacular Pictures from the OEIS page!
0,3
The number of n-node binary trees fixed by the corresponding automorphism(s).
Table of n, a(n) for n=0..20.
A. Karttunen, C-program for computing the initial terms of this sequence
Sequence in context: A180019 A112801 A173862 * A096323 A035682 A054543
Adjacent sequences: A089870 A089871 A089872 * A089874 A089875 A089876
nonn
Antti Karttunen, Nov 29 2003
approved